package _binary_search;

/**
 * 852. 山脉数组的峰顶索引
 */
public class No852 {
    public int peakIndexInMountainArray(int[] arr) {
        int left = 0, right = arr.length - 1;
        while (left <= right) {
            int mid = left + (right - left) / 2;
            if (arr[mid] < arr[mid + 1]) left = mid + 1;
            else right = mid - 1;
        }
        return left;
    }
}
